The study, recently published in the journal Motivation and Emotion, was conducted by researcher Henk van Steenbergen along with colleagues from Leiden University and the University of Maryland.

Steenbergen analyzed how 43 participants in new relationships (meaning less than six months) performed specific tasks, including separating relevant and irrelevant information. His results indicated that "high levels of passionate love of individuals in the early stage of a romantic relationship are associated with reduced cognitive control." In other words, participants were so consumed by thoughts of their beloved, their ability to concentrate and perform the tasks was diminished.

Steenbergen says the phenomenon may be attributed to how the brain allocates its limited resources. "It could be that the obsessive nature of passionate love imposes important constraints on performing well in tasks that require self-control." Meaning, if your brain is on overdrive thinking about love, it's less able to focus on other things.

(huffingtonpost.com)